Extending an existing Java Program using replication & remote procedure calling

Client has provided with the source code of already existing program and wants some additions to it using replication and remote procedure calling. I am attaching requirements document along with the source code. You need to modify the code as needed. Please have a look at the requirements document that contains all the final material that you need to provide (code with some documentation) and the existing source code. Please quote after reading all the details.